Feeding mechanism for mixing-mills.



W. JAMESON.

FEEDIIIG MECHAIIISIII FoII IIIIXIIIG II-IILLS.

APPLCATlON FILED MAY .0. 1917.

Patente Apr. 29, 1.919.

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VV. JAMESON.

FEEDlNG MECHANISM Foa MIXING MILLS.

. APPLICATION FILED IIIAYIO, 1911.

Patented Ap?. 29 IMQ.

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stradine ienrnrrr erwin WELLM JMESON, 0F CHCOPEE FALLS, MASSACHUSETTS, -SSIG-NOR TO THE FISK RUBBER COMPANY, OF CHCOIPEE FALLS, MASSAQHUSE'ETS, .d CORPORATION 0F MASSACHUSETTS.

trannie inncnamsn ron nimma-MILLS.

Lacasse.,

Specification of Letters Patent.

Patented Apr. 29, 14H9.,

Applicatienled May 10, 1917. Serial lvm-167,676.

To all whom t may concern:

Be it known that ll, WILLIAM JAMEsoN, a citizen of the United States of Amerlca,

residing at Chicopee Falls, inthe county of tion.

This invention relates to improved feeding mechanism for mixing mills and, while the invention is capable of general application, it finds one advantageous specific use in rubber manufacture. For example, the invention may be utilizedto supply charges of chemicals of various sorts, usually in powder form, to the mixing millA to bel` worked into the rubber andto collectand return any surplus material not worked into the rubber by the mill to the latter until all of the charge has been worked into the rubber.'

The invention has for its object to provide means for feeding material to a mixing mill and improved means to collect and return to the mill any surplus material passing therethrough as will bemore particularly pointed out in the appended claims.

The invention in an embodiment atpresent preferred is shown for illustrative purposes in the accompanying drawings, inv

which- Figure l is a sectional view of a mixing machine showing the invention as applied thereto; and

Fig. 2 is a plan view thereof.

Referring to these drawings in detail, A' represents the frame of the mixing machine in which a pair of rolls b are journaled. The distance between the rolls may be varied as desired by screws c, the rolls being mounted in slidable bearings (not shown) in the usual and well known manner. Rolls -b are connected by intermeshing gears d' worked into sheet form, certain chemicals,

usually in powder form, such as coloring matter, for example, are introduced into the bight of` rolls b and mixed with and thoroughly worked into the rubber. This invention is more particularly concerned with mechanism to feed such chemicals to the mixing mill and with means to collect and return to the mill such surplus powder as falls from the -rolls b during the mixing operation.

The chemicals are contained in a closed storage hopper 5 which'may be arranged in mixing mill. Hopper 5 is arranged for gravity discharge into a pipe line 6, and the rate of discharge may bev regulated by a valve 7 in the hopper, the stem 8 of the valve extending upwardly through the hopper and its cover and having a hand nut 9 threaded thereon, whereby the valve may be lifted or lowered in an obvious manner. The pipe line 6, to which other hoppers containing other chemicals may be connected, if desired, in the manner described, terminates at and is connected with a suitable fan, indicated in conventional form at 10. A suitable gate valve 10 is provided in pipe 6 between hopper 5 and fan l0. The outlet of the latter is connected by a pipe line 11 to a hopper 12 which is suitably mounted from frame A above the rolls and is preferably mounted so that its discharge falls on only pine elf the traveling rolls b, as shown in The fan 10 draws such chemicals as are deposited in pipe 6 by container 5, or any other container which may be connected to pipe', through the latter and forces the chemicals into hopper 12. hopper referred to is preferably a cyclone separator of well known construction in whichthe air is discharged at the top and the material at the bottom. The chemicals fall from the latter directly upon the rubber and are gradually mixed therewith and worked therein. ln thus mixing the chemicals with the rubber, there is a tendency for some of the former to fall between the rolls and to drop from the rubber duringl'izts travel around the lower periphery of ro The latter or.

-a convenient location at a distance from the I as falls below rolls b, an endless belt 13 is provided which 'is m lunted on suitable rolls 14; so that the upper travel of the belt is substantially horizontal and preferably at such a distance below -rolls b thatthe` belt does not engage' the rolls or the rubber thereon. Qne. roll 14 may be driven `by a .'chain 15 and suitable sprockets from one roll b, as shown in F igs. land 2. Below the conveyer 13 4is a trough 16 to .collect what small amounts of powder fall from the conveyer.. lThe belt conveyer carries the surplus pwder to the left, -as viewed in is .a brush 1 8, the bristles of which extend Fig. 1,.and, as conveyer 13 travels to the left, the powder is plowed or scraped toward the center of the c onveyer by two oppositely arranged bars 17 which are lsuitably llixed to 'frame A and extend inwardly toward one another with 'a forward inclination in the direc/tion of travel of the conveyer.4 Fixed to the left hand end of trough 1 @horizontally toward and bear aga-inst the conveyer 13 as it. travels around left handv roll 14. Brush 18 holds back the powder ,from the conveyerand 'prevents any appre- :ciablefamount from fallinginto trough 16. Just above the brush 1S is a nozzle 19 which terminates closely adjacent the conveyerl. Nozzle 19 preferably is only slightly longer than the distance between-the free ends of the described scraper arms 17, although obviously it may extend entirely across the conveyer, if desired, in which case the arms 17 would not be required. Nozzle 19 is connected by vsuitable means, such as a flexible hose 20, for example, to the described pipe (i. The suction from fan 10 -will drawthe.l powder collected by conveyerl back to the upper part of pipe 6. lf ate 1 0 is closed, the strong suction througlr f ose 20 will draw the powder tobe again delivered to the hopper 12. The brush 18, aside fromits described lfunction, also acts to loosen any powder clinging to the conveyer belt 13, so

. fain that it may be readily withdrawn by the\ nozzle 1.9.

Preferably another flexible-hose 22, having a valve 23 therein.l is connected to the Hose 22 -ivith suitable terminal vtools is used, when desired, to remove such powdelas lodges in trough 16 and may be charge from hopper 12 is discharged and whatever powder falls from the rolls or the Ifilm of rubber is returned by conveyer'13 and nozzle 19 to the fan 10 and thence to the hopperv 12, so that none of the charge 1s wasted. Thus, the conveyer 13 furnishes a convenient indication of the completion of the mixing of the powder with the rubber,

for, ywhen the' conveyer is free from ppwder,

it is apparent that all the charge in hopper 12 has been worked into the rubber.

It is important to'. note that charges of various kinds of powders mary be introduced into hopper 12 when several containers 5 are connected to pipe 6.vr All but one of the series of containers may beclos'ed oli' by valves 7 or two or .more may be opened in a regulable manner at the same Atime tov obtain a mixed charge of two or more kinds of lchemicals..

The mechanism described permits powder to be carried in an improved manner in continuous cycles of operation through the mixing mill until al1 the powder has been worked into the rubber, and it. is characterl ized by eiiecting this result vwithout yunduly scattering the powder about the machine.

The suction nozzle 19 creates a draft which acts to prevent the powder from scattering 'in small clouds into. the surroundingfair.

Aside from the desirable features of cleanliness in Operation, the arrangement is of 'importance in safeguarding'the"-health of the operatives. Mixing mills have heretofore been constructed lin which a belt conveyer,

as 13, not onlytravels under the bight. of

the rolls bu-t part way around and'a'gainst one of'the rolls. The powder is thus re-l turned and .pressed by the -belt against the rub-ber. This prior construction is characterized by means for guiding thev conveyer and placing it into and away from. p0- sition against the mixingroll. Thus, in order to expose the roll against which the conveyer belt is pressed, the latter must be swung out of the-way. The mechanism and labor necessary for. such an operation 'are' objectionable. `By means of the. present i11- vention, such mechanism and labor. are rendered unnecessary.

Thus, the invention provides an improved feeding apparatus for passing' materials,

such as powderand the like, in 1a circuit through a mixing mill. The invention has been described herein for the purpose of illustration. but the scope of the invention is defined by. the appended claims rather than by the foregoing description.

What I claim 1s- 1'-. The combination with the rolls of a mixing mill', of a hopper t0 feed vmaterial thereto, a storage .container for said materiall at 'a distance from the hopper, 'pneumatlc means to convey the material,

which'passes through the rolls and is unn'nxed thereby, back to the hopper to .be subsequently fed to the rolls, 4and means to roe recense connect said container to said pneumatic means when desired, whereby a charge of material may be delivered from the container to the hopper.

2. The combination with the rollsof a 'constructed and arranged so that 4the material is carried in a definite path succes sively through the rolls until all4 of the charge has been mixed with other material by said rolls.

3. -The combination with the mixing rolls of a mixing mill, of a hopper to feed material to said rolls to be mixed with other substances separately fed to the rolls, means movable below the rolls to collect the material; which passes through the rolls unuixed with said substances, and pneumatic means to convey the collected unmixed material back to the hopper to be subsequently fed to the rolls.

el.. The combination with the mixing rolls of a mixing mill, of a hopper to feed material to said rolls to be mixed with other substances separately fed to the rolls, a conveyer below the rolls to receive such material as -passes through Athe rolls unmixed with said substances, a nozzle adjacent the conveyer, connections between the nozzle and the hopper, and means to remove thematerial from the conveyer by suction through said nozzle and force it back to the hopper to be subsequently fed to the rolls.

5. The combination with the mixing rolls of a mixing mill, of a hopper to feed material to said rolls to be mixed with other substances separately fed to the rolls, a conveyer mounted to travel. below Said rolls and upon which material unmixed lo the rolls with said substances may fall, a rush engageable with the conveyer, a nozzle adjacent the conveyerv and brush, plows to d1- `vert the material on the conveyer into the path of the nozzle, and pneumatic means connected with the latter and said hopper to remove the material from the conveyer and return it to said hopper.

6. The combination with the rolls of' a mixing mill, of a hopper to feed powders and the like 'thereto to be mixed with other substances separately fed to the rolls, a con`1 veyer mounted to travel below the rolls to receive such powders as are unmixed with the substances by the rolls, and pneumatic means to remove'tne unmixed powder from the conveyer and return it t0 Said hopper to' be subsequently fed to the rolls, Sa1d laste named means being constructed and lara' ranged to create a draft between and below. the rolls to prevent scattering of the powder and diffusion of the latter into the Surf rounding air. 7. The combination with mixing rolls, of a hopper arranged to discharge into the bight of the rolls, a conveyer arranged to receive material from between the rollsand pneumatic means associated with the hopper and conveyer to cause the material not vheld on the rolls to pass through a complete cycle from and to the bight of the rolls.

- 8. The combination with mixing rolls, of a hopper arranged to discharge into the bght of the rolls, a belt conveyer arranged to travel under the rolls, means to hold material at a given point on the belt against travel therewith, and pneumatic means to convey such material to the hopper.

WILLIAM JAMESON.

vcopies of this patent may be obtained fo'r ave cenas each, by addressing the Commissioner of Patents, Waarnemen, 1D. G." 

